Thanks for posting this for sure, everyone will now know the details. You really are taking a risk with engine mods, a lot can go wrong in every specific situation. However, the gratification when showing up a CLS 55 or Porsches w/ bad drivers (ha) is pretty awesome. Question is what kind of driver are you, one who uses the power regularly or just likes the idea. If the latter don't mod, not worth money or risk. Give and take.